gpiod.h: add line request helpers

Add inline functions to gpiod.h which allow to request lines with
less arguments.

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>

diff --git a/gpiod.h b/gpiod.h
index 13b0277b8cf0a8dd0d9ed3204bf5997fa517c5f9..bbebbd332bb8a826216afae758151a0b552c5be0 100644 (file)
--- a/gpiod.h
+++ b/gpiod.h
@@ -394,6 +394,49 @@ int gpiod_line_request(struct gpiod_line *line,
                       const struct gpiod_line_request_config *config,
                       int default_val) GPIOD_API;
 
+/**
+ * @brief Reserve a single line, set the direction to input.
+ * @param line GPIO line object.
+ * @param consumer Name of the consumer.
+ * @param active_low Active state of the line (true if low).
+ * @return 0 if the line was properly reserved, -1 on failure.
+ */
+static inline int gpiod_line_request_input(struct gpiod_line *line,
+                                          const char *consumer,
+                                          bool active_low)
+{
+       struct gpiod_line_request_config config = {
+               .consumer = consumer,
+               .direction = GPIOD_DIRECTION_INPUT,
+               .active_state = active_low ? GPIOD_ACTIVE_STATE_LOW
+                                          : GPIOD_ACTIVE_STATE_HIGH,
+       };
+
+       return gpiod_line_request(line, &config, 0);
+}
+
+/**
+ * @brief Reserve a single line, set the direction to output.
+ * @param line GPIO line object.
+ * @param consumer Name of the consumer.
+ * @param active_low Active state of the line (true if low).
+ * @param default_val Default line value.
+ * @return 0 if the line was properly reserved, -1 on failure.
+ */
+static inline int gpiod_line_request_output(struct gpiod_line *line,
+                                           const char *consumer,
+                                           bool active_low, int default_val)
+{
+       struct gpiod_line_request_config config = {
+               .consumer = consumer,
+               .direction = GPIOD_DIRECTION_OUTPUT,
+               .active_state = active_low ? GPIOD_ACTIVE_STATE_LOW
+                                          : GPIOD_ACTIVE_STATE_HIGH,
+       };
+
+       return gpiod_line_request(line, &config, default_val);
+}
+
 /**
  * @brief Reserve a set of GPIO lines.
  * @param line_bulk Set of GPIO lines to reserve.
@@ -410,6 +453,50 @@ int gpiod_line_request_bulk(struct gpiod_line_bulk *line_bulk,
                            const struct gpiod_line_request_config *config,
                            int *default_vals) GPIOD_API;
 
+/**
+ * @brief Reserve a set of GPIO lines, set the direction to input.
+ * @param bulk Set of GPIO lines to reserve.
+ * @param consumer Name of the consumer.
+ * @param active_low Active state of the lines (true if low).
+ * @return 0 if the lines were properly reserved, -1 on failure.
+ */
+static inline int gpiod_line_request_bulk_input(struct gpiod_line_bulk *bulk,
+                                               const char *consumer,
+                                               bool active_low)
+{
+       struct gpiod_line_request_config config = {
+               .consumer = consumer,
+               .direction = GPIOD_DIRECTION_INPUT,
+               .active_state = active_low ? GPIOD_ACTIVE_STATE_LOW
+                                          : GPIOD_ACTIVE_STATE_HIGH,
+       };
+
+       return gpiod_line_request_bulk(bulk, &config, 0);
+}
+
+/**
+ * @brief Reserve a set of GPIO lines, set the direction to output.
+ * @param bulk Set of GPIO lines to reserve.
+ * @param consumer Name of the consumer.
+ * @param active_low Active state of the lines (true if low).
+ * @param default_vals Default line values.
+ * @return 0 if the lines were properly reserved, -1 on failure.
+ */
+static inline int gpiod_line_request_bulk_output(struct gpiod_line_bulk *bulk,
+                                                const char *consumer,
+                                                bool active_low,
+                                                int *default_vals)
+{
+       struct gpiod_line_request_config config = {
+               .consumer = consumer,
+               .direction = GPIOD_DIRECTION_OUTPUT,
+               .active_state = active_low ? GPIOD_ACTIVE_STATE_LOW
+                                          : GPIOD_ACTIVE_STATE_HIGH,
+       };
+
+       return gpiod_line_request_bulk(bulk, &config, default_vals);
+}
+
 /**
  * @brief Release a previously reserved line.
  * @param line GPIO line object.